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Finding the Fourth Proportional to 21,001.97, 31,502.97 and 19,718.93

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Solution

The fourth proportional to 21,001.97, 31,502.97 and 19,718.93 is: 29,578.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,001.97 : 31,502.97 = 19,718.93 : x
  2. Step 2: Convert to fraction form
    21,001.97/31,502.97 = 19,718.93/x
  3. Step 3: Cross multiply
    21,001.97x = 31,502.97 × 19,718.93
  4. Step 4: Simplify right side
    21,001.97x = 621,204,702.71
  5. Step 5: Solve for x
    x = 621,204,702.71/21,001.97
  6. Step 6: Final answer
    x = 29,578.41

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.